Drive Arrangement and Drive Arrangement for a Twin-Wire Press

ABSTRACT

A drive arrangement comprising a roll with a roll bearing, a bearing housing and a motor, wherein the bearing housing of the roll bearing is connected to a frame or a foundation and a drive torque of the motor can be transmitted to the roll. The motor is connected to the bearing housing and a reaction torque of the motor can be transmitted into the bearing housing. This allows avoidance of mechanical stresses introduced into the roll with good accessibility of the rolls.

BACKGROUND

The invention relates to a drive arrangement comprising a roll rotatable around an axis, a roll bearing, a bearing housing, and a motor, wherein the roll is mounted via the roller bearing, the bearing housing of the roll bearing is connected to a frame or a foundation and a drive torque of the motor can be transmitted to the roll.

The invention further relates to a twin wire press comprising a first roll for driving a first clothing and a second roll for driving a second clothing, wherein at least one roll comprises a drive arrangement according to the invention. The invention also relates to the use of a drive arrangement according to the invention for driving a roll in a twin wire press.

A drive arrangement is disclosed in DE202013009581 U1. For example, a rotation means, such as a motor, is attached to the axle of a roll, whereby the rotation means has a rotation shaft designed as a hollow shaft and a torque can be transmitted to the axle of the roll via the rotation shaft.

DE1020060853 A1 discloses a roll drive unit with a gear comprising a housing, a central gearwheel, and an output shaft. The roll drive unit further comprises a drive motor, which is in drive connection with the central gear via a pinion.

DE1427925 A1 discloses a compact electric gear roll with low flywheel mass and rigid bearing, wherein a planetary gear is arranged inside the bearing housing. In particular, the planet carrier is kept so rigid that impacts from the roll do not exert any displacement and thus no edge engagement on the toothing, so that jamming is not to be feared. The motor is connected to the planetary gear via a torsion bar, whereby the torsion bar acts as the inner sun wheel of the planetary gear and at the same time as a torsionally flexible coupling, which can compensate for misalignments of the electric motor. Furthermore, an elastic intermediate piece is installed between the base frame and the bearing housing to soften load shocks from the roll.

CH671892 A5 discloses a single drive of rolls comprising a direct drive consisting of a motor and reduction gear, wherein the direct drive is flanged to the bearing housing and the torque exerted by it is supported on this housing. To transmit the torque, a slip-on gear—usually designed as a toothed shaft—engages in recesses in the shaft of the reduction gear and the shaft journal. By using the shaft-mounted gearbox, the influence of the roll on bending due to the inclined position of the direct drive is eliminated.

DE1285972 B discloses an individual drive for straightening rolls of a sheet metal straightening machine with planetary gears, wherein the rolls are mounted in tiltable bearing housings via roll bearings and each straightening roll has an individual drive consisting of an electric motor flanged directly to the bearing housing and of a planetary gear which is accommodated in a bore of the bearing housing.

DE2629039 A1 discloses a roller conveyor driven by a geared motor, the journals of which are rotatably mounted in bearing housings, the geared motor being directly flanged to the bearing housing.

Twin wire presses for dewatering a fibre suspension allow the formation of a continuous fibre web. For example, a twin wire press and in particular the frame for a twin wire press is described in AT 502 584 A2.

In twin wire presses, a fibre suspension is concentrated from an inlet concentration of e.g. 3 wt. %-8 wt. % to an outlet concentration of e.g. >30 wt. %. Typically, twin wire presses comprise a first clothing run with a first clothing and a second clothing run with a second clothing, the clothing being permeable—e.g. as a wire. The fibre suspension is introduced between the circulating fabrics and dewatered. Each clothing run comprises at least one driven roll to which the drive torque of a motor can be transmitted via a gear unit.

A typical drive arrangement is characterized in that the driven rolls are arranged one above the other and the gear units are each mounted on the respective roll necks, the gear units also being arranged one above the other. In this arrangement, for example, the respective motor is connected to the frame and the gear units arranged one above the other are connected via connecting torque brackets, which prevent the gear housings from twisting. This arrangement is obvious because the drive—comprising motor, gear unit, coupling, etc.—is built from independent standard components and must ultimately fit a very specific arrangement.

Conventional drive arrangements have several disadvantages. Thus, when the gear unit is mounted on the roll neck, the weight of the gear unit rests on the roll neck and causes a bending load. When torque brackets are used to prevent the gear unit housing from twisting, the roll necks are also loaded by the torques of the torque brackets. In general, accessibility to the individual components of the drive arrangement is more difficult. In addition, removal of the drive roll requires prior disassembly and dismantling of the drive.

SUMMARY

The aim of the invention is an effective drive arrangement, a minimization of mechanical loads introduced into the roll via the drive arrangement, e.g. bending loads, with good accessibility to the individual components of the drive arrangement as well as the rolls.

According to the invention, this is achieved in that the motor is indirectly connected to the bearing housing of the roll bearing and a reaction torque of the motor can be transmitted to the bearing housing of the roll bearing. The rotatable roll is supported by a roll bearing and the bearing housing of the roll bearing is connected to a machine frame or foundation. For example, the rotatable roll includes a roll neck on the drive side, the roll neck being supported in the roll bearing. The motor transmits a drive torque to the roll, e.g. to the roll neck, with further components, e.g. a gear unit, a coupling, etc., being arranged between the roll and the motor to transmit the drive torque. According to the action-reaction principle, the drive torque generated by the motor causes a reaction torque. According to the invention, the drive arrangement provides for the introduction of the reaction torque of the motor into the bearing housing of the roll bearing. The motor reaction torque can be transmitted by indirectly connecting the motor housing to the bearing housing. An indirect connection of the motor housing can be made, for example, via the components located between the bearing housing and the motor. For example, a gear unit may be disposed between the bearing housing and the motor, with the motor housing connected to the gear unit housing, for example, and further connected to the bearing housing. The indirect connection of the motor housing to the bearing housing further allows the dead weight of the drive arrangement to be transferred to the bearing housing. There is no load on the roll or the bearing neck.

According to the invention, the motor is connected to the bearing housing, wherein the motor is connected to the bearing housing at least via a gear. In this way, the reaction torque of the motor can be transmitted to the bearing housing.

In a further advantageous embodiment, a connecting element is arranged between the bearing housing and the gear unit, wherein the motor is connected to the bearing housing via the gear unit and the connecting element. This connecting element is designed, for example, as a gearbox lantern. The connecting element allows the motor and the gear unit to be connected on one side and the bearing housing on the other, whereby the reaction torque of the motor can be transmitted to the bearing housing of the roll bearing via the connecting element. Advantageously, the coupling can be arranged inside the connecting element, whereby the drive torque of the motor can be transmitted from the gear unit to the roll via the coupling.

An equally favourable design of the drive arrangement is characterised in that the drive torque of the motor is effective about the axis of the rotatable roll. Advantageously, the drive shaft of the motor and the axis of the rotatable roll are aligned, so that the drive torque of the motor acts around the axis of the rotatable roll. This results in a drive arrangement around or along the axis of the rotatable roll. The various components of the drive arrangement, such as the coupling, the connecting element, the gear unit, and motor, are arranged along the axis of the rotatable roll or the components surround the axis of the rotatable roll. When driven rolls are arranged vertically one above the other, each individual driven roll has its own drive arrangement, whereby the efficient arrangement of the components along the axis of the rotatable roll according to the invention allows the available space to be used optimally.

An advantageous design of the drive arrangement is characterised in that the drive torque of the motor can be transmitted to the roll via the gear unit and a coupling arranged between the gear unit and the roll bearing. According to the invention, the roll is mounted via the roll bearing and the bearing housing is connected to a frame or foundation, whereby the reaction torque of the motor can be introduced into the bearing housing. The roll bearing can, for example, be accomplished by arranging the roll neck in the roll bearing. The drive torque of the motor is transmitted to the roll and the reaction torque to the bearing housing of the roll. This allows an advantageous modular design of the drive arrangement and improved accessibility. Particularly advantageous is the arrangement of the coupling within a connecting element that connects the bearing housing with the gear unit or the motor, whereby the coupling is multi-sectional. Thus, by detaching the coupling element from the bearing housing, the coupling element together with the gear unit and motor can be removed from the bearing housing, leaving at least one part of the coupling on the roll and a second part of the coupling is removable together with the gear unit and motor.

According to the invention, an alignment of the gear unit deviating from the axis of the rotatable roll can be compensated by the coupling. Thus, the gear unit transmits the drive torque of the motor to the axis of the rotatable roll. In this case, the coupling allows compensation in the event of deviating alignment of the roll and gear unit or motor.

According to the invention, the coupling comprises a first coupling element and a second coupling element, wherein the first coupling element is connected to the roll, the second coupling element is connected to the gear unit, wherein a third coupling element connects the first coupling element and the second coupling element, and by means of the third coupling element an orientation of the gear unit deviating from the axis of the rotatable roll can be compensated. The first coupling element is firmly connected to the roll and the second coupling element is firmly connected to the gear unit. Compensation for a deviating alignment of roll and gear unit is made between the first coupling element and third coupling element and/or by compensation between the second coupling element and third coupling element. This is easily realised by interlocking between the first coupling element and third coupling element, or the second coupling element and third coupling element. The first coupling element or the second coupling element comprises, for example, a coupling hub.

In a further advantageous embodiment, the coupling comprises a shrink disc, wherein the drive torque of the motor can be transmitted to the roll via the shrink disc and the shrink disc is connected to the roll. For example, the shrink disc is shrunk onto the roll neck of the roll, whereby the shrink disc is firmly connected—e.g. screwed—to the first coupling element, for example with the first coupling hub.

The invention also aims to provide a space-saving and easily accessible drive arrangement in a twin wire press. According to the invention, this is achieved by the twin wire press comprising a drive arrangement according to the invention. Typically, a twin wire press comprises a first roll for driving a first clothing and a second roll for driving a second clothing. Especially with driven rolls arranged one above the other, the roll arrangement according to the invention allows better accessibility.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described using the examples in the drawings.

FIG. 1 shows a drive arrangement according to the state of the art.

FIG. 2 shows the roll bearing of a drive arrangement according to the invention.

FIG. 3 shows the roll bearing and a coupling element of a drive arrangement according to the invention.

FIG. 4 shows the roll bearing and coupling elements of a drive arrangement according to the invention.

FIG. 5 shows the motor, gear unit and a coupling element of a drive arrangement according to the invention.

FIG. 6 shows a connecting element of a drive arrangement according to the invention connected to the bearing housing.

FIG. 7 shows a drive arrangement according to the invention on rolls arranged one above the other.

DETAILED DESCRIPTION

FIG. 1 shows a drive arrangement according to the state of the art. Two rolls 1′, 10′ are arranged one above the other. The rolls 1′, 10′ are each mounted via a roll bearing 3′, whereby the bearing housings 4′ of the roll bearings 3′ are connected to a frame 16′. On the drive side, the rolls 1′, 10′ are mounted in the roll bearings 3′ by means of roll necks 2′ and gear units 8′ are mounted on the roll necks 2′ in each case. Corresponding to the arrangement of the rolls 1′, 10′ one above the other, the gear units 8′ are also arranged one above the other, whereby a reaction torque is absorbed by a connection of the gear units 8′ by a torque bracket. The gear units 8′ are each driven by a motor 6′ attached to the frame 16′, the motor 6′ transmitting the drive torque to the gear unit 8′ via a cardan shaft.

FIG. 2 shows the roll bearing of a drive arrangement according to the invention. In this case, the roll 1,10, which is rotatable about the axis 7, is mounted via the roll bearing 3, wherein the roll 1,10 comprises a roll neck 2 and the roll neck 2 is mounted in the roll bearing 3. The roll bearing 3 comprises a bearing housing 4, whereby the roll bearing 3 or the roll bearing 3 is connected to a frame or a foundation via the bearing housing 4.

FIG. 3 shows the roll bearing and a coupling element of a drive arrangement according to the invention. The roll 1,10 is supported by the bearing 3, whereby the bearing housing 4 of the roll bearing 3 is connected to a frame or a foundation. A drive torque of a motor can be transmitted to the roll 1,10 via a coupling 11, wherein the coupling 11 comprises a first coupling element 13 and the first coupling element 13 is connected to the roll 1,10. The first coupling element 13 is designed as a coupling hub, for example. The coupling may further comprise a shrink disc 12 for transmitting the drive torque of the motor, wherein the shrink disc is connected to the roll, e.g. shrunk onto the roll neck 2, and the first coupling element 13 is connected to the shaft 1,10 via the shrink disc 12. For example, the first coupling element 13 is detachably connected to the shrink disc 12—for example, the coupling element 13 can be screwed to the shrink disc.

FIG. 4 shows the roll bearing and coupling elements of a drive arrangement according to the invention. In addition to FIG. 3 , a third coupling element 15 is shown in FIG. 4 . In this case, the first coupling element 13 is connected to the roll 1,10 via the shrink disc 12, whereby the third coupling element 15 allows the transmission of the drive torque of the motor 6 to the first coupling element 13 and a compensation of an orientation of the gear unit 8 deviating from the axis 7 of the rotatable roll 1,10. The connection between the first coupling element 13 and the third coupling element 15 is realised, for example, by a toothing. This design makes it easy to remove the third coupling part 15 from the first coupling part 13 connected to the shaft 1,10.

FIG. 5 shows the motor, gear unit and a coupling element of a drive arrangement according to the invention. In this case, the reaction torque of the motor 6 can be transmitted to the gear unit 8, whereby the housing of the motor 6 is connected to the housing of the gear unit 8 and thus the reaction torque can be transmitted. Further, the drive torque of the motor 6 is transmitted to the gear unit 8 and further to the second coupling element 14. The second coupling element 14 is firmly—e.g. screwed—connected to the gear unit 8 and is designed, for example, as a coupling hub. Here, the drive torque of the motor 6 acts around the axis 7 of the rotatable roll 1,10, or the components of the drive arrangement are arranged along the axis 7.

FIG. 6 shows a connecting element of a drive arrangement according to the invention connected to the bearing housing. In this case, the connecting element 9 is connected on one side to the bearing housing 4 and on the other side to the gear unit 8 and the motor 6 and the reaction torque of the motor 6 can be transmitted to the bearing housing 4 via the gear unit 8 and the connecting element 9. The connecting element 9 is designed as a gearbox lantern, whereby the connecting element 9 is arranged around the axis 7. Advantageously, the drive torque is transmitted from the motor 6 to the roll 1,10, the drive torque being transmitted from the motor 6 to the roll 1,10 via the gear unit 8 and the coupling 11, the coupling being arranged inside the connecting element 9 and the drive torque of the motor 6 acting around the axis 7 of the rotatable roll 1,10.

FIG. 7 shows a drive arrangement according to the invention on rolls arranged one above the other. A first roll 1 and a second roll 10 are shown, each with a drive arrangement according to the invention. Roll 1 and roll 10 are arranged one above the other, which is typically the case in twin wire presses, with roll 1 being part of a first clothing run and roll 10 being part of a second clothing run. Thus, the roll 1,10 is supported by the roll bearing 3, whereby the roll bearing 3 comprises a bearing housing 4 and the bearing housing is connected to a frame or a foundation. The components of the drive arrangement are arranged along the axis 7, with the drive torque of the motor 6 acting around the axis 7 of the rotatable roll 1,10. The drive torque of the motor 6 is transmitted to the roll 1,10 via the gear unit 8 and the coupling 11. At the same time, the reaction torque of the motor 6 is transmitted to the bearing housing via the gear unit 8 and the connecting element 9. For this purpose, the housing of the motor 6 is connected to the housing of the gear unit 8 with the connecting element 9 and further to the bearing housing 4. In FIG. 7 these connections are shown as bolted connections. Advantageously, the coupling 11 is arranged inside the connecting element 9. Thus, it is easily possible to remove the coupling element 9 together with the gear unit 8 and motor 6 from the bearing housing, whereby the coupling 11 is multi-sectional and at least one coupling part—e.g. the second coupling element 14, which is firmly connected to the gear unit 8—can be removed together with the coupling element 9. Thus, at least one coupling element—e.g. the first coupling element 13 which is firmly connected to the shaft 1,10—remains on the shaft 1,10.

The present invention offers numerous advantages, in particular an effective drive arrangement. This means good accessibility to the components of the drive arrangement and in particular to the roll, whereby the modular design allows easy separation of the roll and the rest of the drive arrangement. This makes the roll accessible without having to remove all the other components, such as the coupling, gear unit and motor, individually beforehand or having to remove the other components from the frame or the foundation. At the same time, the drive arrangement according to the invention allows for a minimal load on the shaft, since the weight of the other components of the drive arrangement, but also the reaction torque induced by the motor, is not transferred to the shaft.

REFERENCE NUMERALS

-   -   (1) Roll     -   (2) Roll neck     -   (3) Roll bearing     -   (4) Bearing housing     -   (5) Torque bracket     -   (6) Motor     -   (7) Rotation axis     -   (8) Gear unit     -   (9) Connecting element     -   (10) Roll     -   (11) Coupling     -   (12) Shrink disc     -   (13) First coupling element     -   (14) Second coupling element     -   (15) Third coupling element     -   (16) Frame 

1-10. (canceled)
 11. A drive arrangement comprising: a roll (1,10) rotatable about an axis (7); a roll bearing (3) with a bearing housing (4) connected to a frame (16) or a foundation, the roll bearing (3) mounting the roll (1, 10) whereby a drive torque of the motor (6) can be transmitted to the roll (1,10); and a motor (6) indirectly connected to the bearing housing (4) of the roll bearing (3) at least via a gear unit (8), whereby a reaction torque of the motor (6) can be transmitted into the bearing housing (4) of the roll bearing (3), wherein the drive torque of the motor (6) can be transmitted to the roll (1,10) via the gear unit (8) and a coupling (11) arranged between the gear unit (8) and the roll bearing (3), the coupling (11) comprising a first coupling element (13) and a second coupling element (14) with the first coupling element (13) being connected to the roll (1,10) and the second coupling element (14) being connected to the gear unit (8), and a third coupling element (15) connects the first coupling element (13) and the second coupling element (14), wherein an alignment of the gear unit (8) deviating from the axis (7) of the rotatable roll (1,10) can be compensated by the third coupling element (15).
 12. The drive arrangement according to claim 11, wherein a connecting element (9) is arranged between the bearing housing (4) and the gear unit (8), and the motor (6) is connected to the bearing housing (4) via the gear unit (8) and the connecting element (9).
 13. The drive arrangement according to claim 12, wherein the drive torque of the motor (6) is transmitted from the motor (6) to the roll (1,10) via a coupling (11) arranged inside the connecting element (9).
 14. The drive arrangement of claim 13, wherein the coupling (11) comprises a shrink disc (12) that is connected to the roll (1, 10) and the drive torque of the motor (6) is transmitted to the roll (1,10) via the shrink disc (12).
 15. The drive arrangement of claim 11, wherein the coupling (11) comprises a shrink disc (12) that is connected to the roll (1, 10) and the drive torque of the motor (6) is transmitted to the roll (1,10) via the shrink disc (12).
 16. The drive arrangement of claim 12, wherein the coupling (11) comprises a shrink disc (12) that is connected to the roll (1, 10) and the drive torque of the motor (6) is transmitted to the roll (1,10) via the shrink disc (12).
 17. The drive arrangement according to claim 15, wherein the drive torque of the motor (6) acts around the axis (7) of the rotatable roll (1,10).
 18. The drive arrangement according to claim 11, wherein the drive torque of the motor (6) acts around the axis (7) of the rotatable roll (1,10).
 19. The drive arrangement according to claim 12, wherein the drive torque of the motor (6) acts around the axis (7) of the rotatable roll (1,10).
 20. The drive arrangement according to claim 13, wherein the drive torque of the motor (6) acts around the axis (7) of the rotatable roll (1,10).
 21. A twin wire press, comprising a first roll (1) rotatable about a first axis (7) for driving a first clothing and a second roll (10) rotatable about a second axis (7) for driving a second clothing, comprising: a roll bearing (3) with a bearing housing (4) connected to a frame (16) or a foundation, the roll bearing (3) mounting the first roll (1) whereby a drive torque of the motor (6) can be transmitted to the first roll (1); and a motor (6) indirectly connected to the bearing housing (4) of the roll bearing (3) at least via a gear unit (8), whereby a reaction torque of the motor (6) can be transmitted into the bearing housing (4) of the roll bearing (3), wherein the drive torque of the motor (6) can be transmitted to the first roll (1) via the gear unit (8) and a coupling (11) arranged between the gear unit (8) and the roll bearing (3), the coupling (11) comprising a first coupling element (13) and a second coupling element (14) with the first coupling element (13) being connected to the first roll (1) and the second coupling element (14) being connected to the gear unit (8), and a third coupling element (15) connects the first coupling element (13) and the second coupling element (14), wherein an alignment of the gear unit (8) deviating from the axis (7) of the rotatable first roll (1) can be compensated by the third coupling element (15).
 22. A use of the drive arrangement according to claim 11 in a twin wire press to drive a clothing with the roll (1, 10). 